Thomas Edison's Life

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Telegraphy and Telephony Patents

The following list contains the 186 patents Edison received concerning telegraphy and telephony. It is arranged in chronological order by execution date, which is the date
on which Edison signed the application and the date in the patenting process that comes closest to
the time of actual inventive activity. The application date is the date on which the Patent Office
received and recorded the application; the issue date, the time at which the patent, having passed
inspection and any legal challenges, was awarded.